PP Systems WMA-5 Operation Manual page 38

CO2
390
ppm
Gas Inlet port
2. The pressure regulator should be set to a very low pressure and there should be a slight flow excess
gas venting from the open "T" Piece (approx. 250 ml/min).
3. Select the button to the right of the "CO
allowing a new number to be inputted. See numerical keypad description under Zero Time section for
details.
4. Enter the CO concentration of the calibration gas that you are using. This value must match the
2
certified CO concentration of the calibration cylinder and be similar or higher than the anticipated
2
measurement range of the instrument (i.e. it is best to calibrate the instrument with a reference gas
containing 350 - 450 ppm CO
5. The WMA-5 will then perform a zero. At completion of successful zero, a similar message to the
following will be displayed.
WMA-5 Operation Manual V. 1.01
Excess gas of
approx. 250 cc/min
WMA-5
CO Analyzer
2
In-line "T" piece
to vent excess
gas
Conc (ppm):" text. The numerical keypad will appear
2
when measuring around 350 ppm CO
2
38
Regulator
CO
2
Shut-Off
Gas
Valve
Cylinder
).
2
Pressure
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